describe('addLayers adding multiple markers', function () {
    /////////////////////////////
    // SETUP FOR EACH TEST
    /////////////////////////////
    var div, map, group;

    beforeEach(function () {
        div = document.createElement('div');
        div.style.width = '200px';
        div.style.height = '200px';
        document.body.appendChild(div);

        map = L.map(div, {maxZoom: 18, trackResize: false});

        // Corresponds to zoom level 8 for the above div dimensions.
        map.fitBounds(new L.LatLngBounds([
            [1, 1],
            [2, 2]
        ]));
    });

    afterEach(function () {
        if (group instanceof L.MarkerClusterGroup) {
            group.clearLayers();
            map.removeLayer(group);
        }

        map.remove();
        div.remove()

        div = map = group = null;
    });

    /////////////////////////////
    // TESTS
    /////////////////////////////
    it('creates a cluster when 2 overlapping markers are added before the group is added to the map', function () {

        group = new L.MarkerClusterGroup();

        var marker = new L.Marker([1.5, 1.5]);
        var marker2 = new L.Marker([1.5, 1.5]);

        group.addLayers([marker, marker2]);
        map.addLayer(group);

        expect(marker._icon).to.be(undefined);
        expect(marker2._icon).to.be(undefined);

        expect(map._panes.markerPane.childNodes.length).to.be(1);
    });

    it('creates a cluster when 2 overlapping markers are added after the group is added to the map', function () {

        group = new L.MarkerClusterGroup();

        var marker = new L.Marker([1.5, 1.5]);
        var marker2 = new L.Marker([1.5, 1.5]);

        map.addLayer(group);
        group.addLayers([marker, marker2]);

        expect(marker._icon).to.be(undefined);
        expect(marker2._icon).to.be(undefined);

        expect(map._panes.markerPane.childNodes.length).to.be(1);
    });

    it('creates a cluster and marker when 2 overlapping markers and one non-overlapping are added before the group is added to the map', function () {

        group = new L.MarkerClusterGroup();

        var marker = new L.Marker([1.5, 1.5]);
        var marker2 = new L.Marker([1.5, 1.5]);
        var marker3 = new L.Marker([3.0, 1.5]);

        group.addLayers([marker, marker2, marker3]);
        map.addLayer(group);

        expect(marker._icon).to.be(undefined);
        expect(marker2._icon).to.be(undefined);
        expect(marker3._icon.parentNode).to.be(map._panes.markerPane);

        expect(map._panes.markerPane.childNodes.length).to.be(2);
    });

    it('creates a cluster and marker when 2 overlapping markers and one non-overlapping are added after the group is added to the map', function () {

        group = new L.MarkerClusterGroup();

        var marker = new L.Marker([1.5, 1.5]);
        var marker2 = new L.Marker([1.5, 1.5]);
        var marker3 = new L.Marker([3.0, 1.5]);

        map.addLayer(group);
        group.addLayers([marker, marker2, marker3]);

        expect(marker._icon).to.be(undefined);
        expect(marker2._icon).to.be(undefined);
        expect(marker3._icon.parentNode).to.be(map._panes.markerPane);

        expect(map._panes.markerPane.childNodes.length).to.be(2);
    });

    it('handles nested Layer Groups', function () {

        group = new L.MarkerClusterGroup();

        var marker1 = new L.Marker([1.5, 1.5]);
        var marker2 = new L.Marker([1.5, 1.5]);
        var marker3 = new L.Marker([3.0, 1.5]);
        var layerGroup = new L.LayerGroup([marker1, new L.LayerGroup([marker2])]);

        map.addLayer(group);
        group.addLayers([layerGroup, marker3]);

        expect(marker1._icon).to.be(undefined);
        expect(marker2._icon).to.be(undefined);
        expect(marker3._icon.parentNode).to.be(map._panes.markerPane);

        expect(map._panes.markerPane.childNodes.length).to.be(2);
    });

    it('unspiderfies before adding new Marker(s)', function () {

        var clock = sinon.useFakeTimers();

        group = new L.MarkerClusterGroup();

        var marker = new L.Marker([1.5, 1.5]);
        var marker2 = new L.Marker([1.5, 1.5]);
        var marker3 = new L.Marker([1.5, 1.5]);

        group.addLayers([marker, marker2]);
        map.addLayer(group);

        expect(marker._icon).to.be(undefined);
        expect(marker2._icon).to.be(undefined);

        group.zoomToShowLayer(marker);
        //Run the the animation
        clock.tick(1000);

        expect(marker._icon).to.not.be(undefined);
        expect(marker._icon).to.not.be(null);
        expect(marker2._icon).to.not.be(undefined);
        expect(marker2._icon).to.not.be(null);

        group.addLayers([marker3]);
        //Run the the animation
        clock.tick(1000);

        expect(marker._icon).to.be(null);
        expect(marker2._icon).to.be(null);
        expect(marker3._icon).to.be(undefined);
        expect(marker3.__parent._icon).to.not.be(undefined);
        expect(marker3.__parent._icon).to.not.be(null);
        expect(marker3.__parent._icon.innerText.trim()).to.equal('3');

        clock.restore();
        clock = null;
    });
});
